Tính nhanh:
12 + 88 + 34 + 66
Tính nhanh
( 45+75 ) x 66 + ( 75+45 ) x 34
11+22+33+44+55+66+77+88+99:11
(45+75)*66+(75+45)*34
=(45+75)*(66+34)
=120*100
=12000
11+22+33+44+55+66+77+88+99:11
=11+22+33+44+55+66+77+88+9
=(11+9)+(22+88)+(33+77)+(44+66)+55
=20+110*3+55
=20+330+55
=405
Ta có :
a, (45 + 75) x 66 + (75 + 45) x 34
= (45 + 75) x (66 + 34)
= 120 x 100
= 12000
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 : 11
= 33 + 77 + 121 + 165 + 9
= 405
\(11+22+33+44+55+66+77+88+99:11\)
\(\left(11+99\right)+\left(22+88\right)+\left(33+77\right)+\left(44+66\right)+55:11\)
\(110+110+110+110+55:11\)
\(440+55:11\)
\(445\)
(12+77+34+23+88+45+55+66)x(45200-1808x25)
Tính theo cách theo cách hợp lí
\(=\left[66+34+77+23+12+88+45+55\right]\times\left[1808\times\left(25-25\right)\right]\\ =0\)
Tính theo cách hợp lí:
(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200 – 1808 x 25)
(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200 – 1808 x 25)
=(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200-45200)
=(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x 0
=0
(12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200 – 1808 x 25)
= (12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x (45200 – 45200 )
= (12 + 77 + 34 + 23 + 88 + 45 + 55 + 66) x 0
= 0
= [ (12+88) + (77+23) + (34+66) + (45+55) ] x ( 45200 - 45200 )
= [ 100 + 100 + 100 + 100 ] x 0
= 400
ĐÁP ÁN : 400
( 12+77+34+23+88+45+55+66)* ( 45200-1808*25)
tính theo cách hợp lí
ai giúp mình với
Giải:
( 12 + 77 + 34 + 23 + 88 + 45 + 55 + 66 ) . ( 45200 - 1808 .25 )
=( 12 + 77 + 34 + 23 + 88 + 45 + 55 + 66 ) . ( 45200 - 45200 )
=( 12 + 77 + 34 + 23 + 88 + 45 + 55 + 66 ) . 0
=0
Học tốt!!!
(12+77+34+23+88+45+55+66)* (45200-1808*25)
=(12+77+34+23+88+45+55+66)* (45200-45200)
=(12+17+34+23+88+45+55+66)* 0
=0
\(\left(12+77+34+23+88+45+55+66\right)\times\left(45200-1808\times25\right)\)
\(=\left(12+77+34+23+88+45+55+66\right)\times\left(45200-45200\right)\)
\(=\left(12+77+34+23+88+45+55+66\right)\times0\)
\(=0.\)
Bài 1.Thực hiện phép tính(tính nhanh nếu có thể)
a,(-19)+(-32)+2019+52
b,34-(15+34-40)
c,-11.(-4)+6.(-5)
d,88.(12-67)-12.(88+67)
Mọi người trả lời nhanh giúp minh nha!
a,(-19)+(-32)+2019+52 = -19 + 2019 + 52 - 32
= 2000 + 20
= 2020
b,34-(15+34-40)= 34 - 15 -34 + 40
= -15 + 40
= 25
c,-11.(-4)+6.(-5)= 44 + ( -30)
= 14
d,88.(12-67)-12.(88+67)= 88.12 - 5896 - 12.88 + 804
= -5896 + 804
= -5092
hok tốt!
a,(-19)+(-32)+2019+52
=(-19+2019)+(-32+52)
=2000+20
=2020
b,34-(15+34-40)
=34-15-34+40
=(34-34)-15+40
=0-15+40
=-15+40
=-25
c,-11.(-4)+6.(-5)
=44+(-30)
=14
d,88.(12-67)-12.(88+67)
=88.(-55)-12.155
=-4840-1860
=6700
Tính:
. . . .ai chỉ e cách làm nhanh v
34.66 - 34.4 - 66.34 - 66.4
= ( 34.66 - 66.34) - ( 34.4 +66.4)
= 0 - 4.(34+66)
= -4.100
= -400
\(34.\left(66-4\right)-66.\left(34+4\right)\\ =34.66-34.4-66.34-66.4\\ =\left(34-34-4\right).66-34.4\\ =-4.66-34.4\\ =4.\left(-66\right)-34.4\\ =4.\left(-66-34\right)\\ =4.\left(-100\right)\\=-400\\ -264.\left(-400\right).264.40\\ =264.400.264.40\\ =264.4.100.264.4.10\\ =264.4.264.4.\left(100.10\right)\\ =\left(264.4\right)^2.1000\\ =1115136.1000=1115136000\)
11+89 22+78 33+67 44+56 55+45 66+34 77+23 88+12 99+1
nhanh nhanh tui tick
11 + 89 = 100
22 + 78 = 100
33 + 67 = 100
44 + 56 = 100
55 + 45 = 100
66 + 34 = 100
77 + 23 = 100
88 + 23 = 100
99 + 1 = 100
11+89 22+78 33+67 44+56 55+45 66+34 77+23 88+12 99+1
nhanh nhanh tui tick
11+89=100
22+78=100
33+67=100
44+56=100
55+45=100
66+34=100
77+23=100
88+12=100
99+1=100
11+89 22+78 33+67 44+56 55+45 66+34 77+23 88+12 99+1
nhanh nhanh tui tick
11+89=100 66+34=100
22+78=100 77+23=100
33+67=100 88+12=100
44+56=100 99+1=100
55+45=100
11+89 = 100 ; 22+ 78 = 100 ; 33 + 67= 100 ; 44 + 56 = 100 ; 66 + 34 = 100 ; 55 + 45 = 100 ; 66 + 34 = 100 ; 77 + 23 = 100
88 + 12 = 100 ; 99 + 1 = 100
Chúc bạn học tốt !